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L <br /> ' Pombo Ranch Facility August 17,2004 <br /> Subsurface Investigation Report& <br /> Second Quarter Groundwater Monitoring <br /> ' sample disclosed hi concentrations of gasoline and gasoline constituents. The 15 foot <br /> � g <br /> deep sample was reported as non-detected for the compounds analyzed. <br /> ' adient to avoid shallow soil contamination �+ �"`{� <br /> MW-105 was located further down � <br /> � anon. The �1 � i 4 � <br /> boring was drilled through at least 7 feet of relatively dry clay into a coarse sand and P , <br /> gravel layer. A soil sample was collected every 10 feet for laboratory analysis. The 10 '�f' <br /> foot deep sample contained traces of gasoline and ethyl benzene. Soil samples collected <br /> at depths of 20, 30, and 40 feet were reported as non-detected for the compounds <br /> ' analyzed. <br /> A shallow well, MW-5, was added to the scope of work and located next to MW-105. <br /> ' Soil samples were not collected from this boring since it was situated within five feet of <br /> MW-105. <br /> ' Laboratory Soil Sam le Results (May 5, 2004 <br /> Sample I.D. Gasoline Benzene Toluene E-Benzene Xylenes Oxy's <br /> ' Mg/Kg <br /> EB-4-10' 12 <25 <25 1$8 52 ND <br /> MW-4-10' 405 <625 <625 7000 17300 ND <br /> MW4-15' <1.0 <5.0 <5.0 <5.0 <5.0 I ND <br /> ' MW-105-10' 2.2 <25 <25 25 <25 ND <br /> MW-105-20' <1.0 <5.0 <5.0 <5.0 <5.0 ND <br /> MW-105-30' <1.0 <5.0 <5.0 <5.0 <5.0 ND <br /> MW-10540' <1.0 <5.0 <5.0 <5.0 <5.0 ND <br /> On May 15, 2004 M.3. Kloberdanz & Associates, in conjunction with GeoAnalytical <br /> Laboratories, Inc., conducted quarterly groundwater monitoring of the Pombo Ranch site <br /> at 24100 S. Lammers Road in Tracy, California. Quarterly monitoring activities <br /> consisted of depth to water and water characterization measurements, well purging, <br /> groundwater sample collection and laboratory analysis of water samples collected from <br /> the three groundwater-monitoring wells at this site. <br /> Traces of gasoline and gasoline constituents were detected in all of the wells with the <br /> exception of MW-3. The water sample collected from monitoring well MW-5 disclosed <br /> ' to"w concentration of MTBE. <br /> Laborator 7 Water Sam le Results (May 14, 2004 <br />' Sample I.D. Gasoline Benzene Toluene E-Benzene Xylenes MTBE <br /> Mg/Kg <br /> MW-1 0.05 1.0 4.7 0.8 4.3 <0.5 <br /> MW-2 0.05 0.8 3.5 0.6 3.1 <0.5 <br /> -MW- <0.05 <0.3 <0.3 <0.3 <0.6 <0.5 <br /> MW4 0.41 1.1 <0.3 12 14 20 <br /> MW-5 0.18 0.9 <0.3 6.5 0.5 <0.5 <br /> MW-105 0.14 3.8 16 3.1 16 <0.5 <br />' 5 <br />